Variable condenser for wireless telephony



Aug. 3 1926. 1,594,700

A. G. TRIGG I VARIABLE coNnENsEE `oa WIRELESS TELEPHONY `filed June 15 1925 WIWI E NW1v I y Patented Aue. 3, 1926.

ALBERT GEORGE TRIGG, OF LONDON, ENGLAND.

VARIABLE CONDENSER FOR WIRELESS TELEPHONY.

Application led June 15, 1925, Serial No. 37,365, and in Great Britain December 16, 1924.

This invention relates to variable condensers for wireless telephony of the kind wherein movable vanes are caused to interleave with iixed vanes. f

In condensers of this kind as ordinarily constructed rthe movable vanes are fixed to a rotatable spindle. In some cases the vanos secured to the rotatable spindle are offset in the plane of rotation g but such movable vanes cannot be rotated independently of each other.

According to this invention the movable vanesare so constructed and arranged as to be capable oF independent movement when rotated in the anti-clockwise direction. In carrying out this invention each movable vane is mounted to rotate on a tixed spindle and is provided with a tooth or projection located near to the anis or' rotation, the mov able vanes being arrangedon said axis with the teeth or" each slightly in advance of the next in the series. These teeth or projections are engaged by a pin connected to a plate rotated by the adjusting handle of the con4 denser and are carried round together in a clock-wise direction. But in the reverse action the vanes will be picked up one by one by the pin on the adjustingr handle thus spreading them out through the angle of rotation, in which spread out position they can be further reversely rotated if so desired.

My invent-ion is illustrated in the accompanying drawings in which Fig. l is a section taken on the line l-1 of Fig. 2;

Fig. 2 is a plan view of the condenser with the cover removed;

Fig. 3 is a fragmentary view showing four movable vanes with teeth or projections on their bosses;

Fig. 4 is a plan View of the assembled vanes in the closed position and shows the actuating pin; and

Fig. 5 is a plan of the assembled vanes in the opened out position.

In these drawings l represents the stationary vanes of the condenser secured to the casing 2 by bolts 3. Each of these vanes is of an arcuate shape havingl a central semicircular recess l.

4 represents a fixed shaft on which are loosely mounted the movable vanes 5. Each of these vanes 5 is mainly semi-circular in plan and has a semi-circular boss 6, 6b, 6 and 6d at its centre said bosses corresponding to vand loosely litting in the recesses la in the stationary vanes. Each boss 6a 6 6C and 6 on the movable vanes 5 is provided with a tooth or notch 7, 7b, 7C and 71. As will be seen from Fig. 3 these teeth or notches are stepped one in advance ot' the other with resffect to the straight edge 7 of the vane.

The cover S of the condenser has passed therethrough a rotatable shaft 9 provided with a pointer to pass over a graduated scale in the usual manner. To the bottom of the rotatable shaft 9 is secured a plate 10 carry ing a pin l1. The pin ll is parallel to the tired shaft 9 and eccentric to the axis of said shaft and extends into the casing 2 beyond the movable vanes and engages in the teeth or projections oi all of them.

The condenser operates as follows:-

On rotation ct t ie sha-ft 9 in the clockwise direction the pin ll presses against the straight edges ot ali the movable vanos (4 only are shown but there may be any suitable number) and moves them all together in that direction. This is the position of the parts shown in Fig. 4. By rotating the shaft 9 in the anti-clockwise direction however the movable vanes 5 will be rotated one by one until they occupy the tanned out position in Fig. 5, whereat'ter they may be further rotated in the anti-clockwise direction if so desired. Clockwise rotation of the vanes 'from the position shown in Fig. 5 will again close them together as shown in Fig. 4, Whereafter they may be further rotated if so desired in the clockwise direction.

I claim:

1. A variable condenser for wireless telephony comprising a series of iixed vanes, a series oill movable vanes rotatably mounted so as to be brought into or removed from the spaces between the fixed vanes, a knob or handle for moving said vanes, the said movable vanes being so made that all of them open out or close ianwise in succession by operation of the knob or handle alone.

2. A variable condenser for wireless telephony comprising a series of iixed vanes, a series oi movable vanes rotatably mounted so as to be brougl'it into or removed from the spaces between the iixed vanes, a knob or handle for moving said vanes, each of the said movable vanes being mounted to rotate on the same fixed spindle, the said movable vanes being so made that all of them open out or close fanwise in succession by operation of the knpb or handle alone.

loo

o. A. variable condenser` for Wireless telephony comprising a series of lined Yanes, a series of movable Yanes rotatably mounted so as to be brought into or removed `from the spaces between the ixed Yanes, a straight edge on each movable vane, a mob or handle or moving said Yanes, each ot the said movable Ya es being mounted to rotate on the saine xed spindle, tooth on each movable rane in adYance ot the tooth on the immediately preceding vane, ant means, connected with the lmob or handle, for successively engaging, by rotation in one direction, the teeth ot succeeding Yanes and for operating on the straight edges o'i all the movable Yanes when rotated in tne opposite direction.

L variable condenser for Wireless telephon7 comprising a series fixed vYanes. a series ot movable TJanes rotatably mounted so as to be brought into or reinored from the spaces between the fixed Yanes.y straight edge on each movable rane. a knob or handle for moving said Yanes. each ot said niomble Yanes being mounted to rotate on t" fixed spindle, a tooth on cach moral',- in advance of the tooth on the immco -x preceding Vane, a rotatable shaft mounted in the condenser and to which the knob or handle is secured, a plate secured to said shaft, and a pin on said plate for engaging the teeth on the movable Vanes for rotation in on direction and for engaging the straight edges of the Yanes for rotation in the opposite direction.

5. A Variable condenser for Wireless teleplionj,v comprising a series o fixed fanes, a series moi'able vanos rotatably mounted so as to be brought into or removed roi the between the tif-:ed Yanes, a straight e j 'e on cath ineif'able Vane, knob or handle for moving' said Yanes, each ot the said movable Yanes being mounted to rotate on the ined spindle.I a tooth on each movable ln advance of the tooth on the immog t preceding vane, a rotatable shaft ino'inted in the condenser and to which the l handle is secured, a plate secured tit, and a pin on said plate which on of the shaii't in one direction w rely engages the teeth on succeedinoi'able Yanes and on rotation in the "is direction engages the st 'aight s of all the movable Yanes and moves nnltaneonsly.

` tf.,.-;ri'= no if." whereof I have hereunto set rant this Sth dayY 01": May, 1925.

.LBERT GEORGE TRIGG. 

